SPN 2798 FMI 3 is the Detroit DD Series diagnostic trouble code for injector needle control valve cylinders 4, 5, 6 shorted to battery, and this page documents the 1-page fault-code PDF for it. It gives mechanics the monitored conditions, the step-by-step troubleshooting sequence and the fuel injector circuit checks needed to diagnose the fault. The full document is a Detroit fault code sheet built from Detroit Power Service Literature references.
Official document details
| Brand | Detroit (Detroit Diesel / DTNA) |
| Model coverage | DD13, DD15 and DD16 |
| System / Group | DD Series (EPA 2007-Current) / DTCs — fuel injector circuit |
| Suspect Parameter Number | 2798 |
| Failure Mode Identifier | 3 |
| Fault description | Injector Needle Control Valve Cylinders 4, 5, 6 Shorted To Battery |
| Year / Emissions | EPA10, GHG14 |
| Pages | 1 |
| File size | 0.23 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code header: SPN and FMI identification
- Description and monitored parameters
- Troubleshooting steps
- Component removal references (Detroit Power Service Literature)
- Verification and clearing the code
SPN 2798 FMI 3 diagnostic overview
This code indicates the injector needle control valve circuit for cylinders 4, 5 and 6 is shorted to battery, with a 25% engine derate and MIL and CEL lamps. The sheet lists the monitored parameter and enabling conditions, then measures voltage at the rear fuel injector 14-pin connector and the Motor Control Module pins. Reading SPN 2798 FMI 3 correctly stops parts being replaced before the wiring and mechanical checks are done.
Applicable truck models
This Detroit DD Series fault code sheet applies to the DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) family, covering EPA10, GHG14 configurations, and the same code also appears in Detroit Series 60 DDEC VI listings. Component removals point to Detroit Power Service Literature, and unresolved cases route to the Detroit Customer Support Center at 800-445-1980. Verify engine and emissions level against your build on the official Detroit brand site before ordering parts.
Who needs this SPN 2798 FMI 3 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators running Detroit DD engines use this fuel injector circuit sheet with a diesel diagnostic tool to work the fault methodically instead of guessing.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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